After finishing the SMCTL v1 we stumbled upon
the problem of having complete control over the 1x10 antenna switches and over
the K9AY switching system with different resistors. So we made another Antenna
controller with 10 keys, that can switch all those things J with a dedicated program for the K9AY loop as
described in the on4un’s book Low band DXing.

-12V
on off controller for other 12V hamradio gadgets
(preamp, beveridges, and other switching)

The circuit contains 10 power outputs for controlling
12 Volt ​​relays or other
elements with one common point. Outputs can be controlled positively by using a 2 drivers
UDN2981A (or TD62783) with a common ground, or with a negative control, using a
2x ULN2803A with common +12 V. The circuit lets you connect 10 push button
switches and a PTT interlock (active when grounded). Pressing one of the push
buttons will select the active outputs. When the PTT is grounded an interlock
circuit prevents the user from switching between outputs when in transmit mode
(PTT interlock / hot switch protection).

The circuit logic is controlled by an ATMEGA88
AVR microcontroller. The circuitry and software are designed with 5 different
programs which enable the controller to be used for other switching purposes,
such as a 10x1 antenna switch.

Pressing shortly one button
activates the antenna and if others are active, adds it to the stack.

Holding one button for more as
200ms selects only that antenna (if antenna 1 and 2 are active and you
press for example antenna 2 and hold it for 200ms, now only antenna 2 is
active).

Since the logic for the control
of the SJ2W stackmatch is different as the
logic for the LED diodes, different!!! outputs
are used to lit the LED’s as the outputs used to drive the relays. (using
4 outputs for the antennas and 4 outputs for the led’s – 3 antenna LED +
1 Stack LED)

Ant combination
(SJ2W)

A (K2)

B (K3)

C (K1)

K4/K5

A

1

0

0

1

B

0

1

0

1

C

0

0

1

1

A+B

0

0

1

0

A+C

0

1

0

0

B+C

1

0

0

0

A+B+C

0

0

0

0

4O3A stackmatch program:

Same as the SJ2W program, but
with a different logic

Ant combination
(4O3A)

A (K2)

B (K3)

C (K1)

K4/K5

A

1

0

0

0

B

0

1

0

0

C

0

0

1

0

A+B

1

1

0

1

A+C

1

0

1

1

B+C

0

1

1

1

A+B+C

1

1

1

1

Antenna switches

Up to 10 push button switches can be
used (up to an antenna switch 1x10). Pressing the appropriate button, switches
on an individual antenna, the other antennas are off.

Independent ON/OFF control for up to 6 outputs

The independent on/off
control program is selected by holding down buttons 3 and 6 during power up of
the controller. Electricallyidentical to the previousprogram,
only the buttonsfunction as anon/off switch foreach output, wherechannelsdo not
affect,one another

K9AY loop controller

The controller lets you control
2 DPDT relays that are used for the switching, 5 different variable resistor
values of the 3 relays that control the R and last button is intended for the
preamplifier.

First 4 outputs are for
the LED display of the different bearing of the k9ay, outputs 5 and 6 are for
the relays, outputs 7-9 are for the R, output 10 is
for the preamp.

If you want to make it yourself, drop me an email, I can make some more
PCB’s for the SMCTL v1, SMCTL v2 or SJ2W Stackmatches.